In this work we study the effect of caffeine and taurine on the mobility of water molecules at 298 K using femtosecond mid-infrared and dielectric relaxation spectroscopy. We observe both molecules to have a slowing down effect on the mobility of surrounding water molecules: a single caffeine molecule slows down ~9 water molecules, a single taurine molecule slows down ~4 water molecules. The reorientation time constant of these slow water molecules is 4–5 times longer than the reorientation time constant of 2.5 ps of water molecules in bulk liquid water.

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Publisher IOP Publishing
Funder NWO
Persistent URL
Journal J.Phys.Commun.
Smit, W.J, van Dam, E.P, Cota, R, & Bakker, H.J. (2019). Caffeine and taurine slow down water molecules. J.Phys.Commun., 3(2), 025010: 1–025010: 7. doi:10.1088/2399-6528/ab07e4